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US 10,376,950 B2Granted
Blade, gas turbine including the same, and blade manufacturing method
AssigneeMitsubishi Hitachi Power Systems, Ltd.
InventorsKeita Takamura, Satoshi Hada, Hidekatsu Atsumi, Tomofumi Shintani
Life of this patent
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Abstract
A blade has a blade, passage extending in a blade height direction, a platform passage formed inside a platform, and a communication passage leading from an outer surface of a shaft-mounted part through the platform passage to the blade passage. An inner surface defining an inflow passage portion of the platform passage includes a shaft-side inner surface that faces a gas path side. The shaft-side inner surface spreads in a direction having more of a component of a blade thickness direction than a component of the blade height direction. An inner surface defining the communication passage joins to the shaft-side inner surface.
Claims16
A blade comprising:
- a blade body that forms an airfoil and is disposed inside a combustion gas flow passage through which combustion gas flows;
- a platform that spreads from an end in a blade height direction of the blade body in a direction having a component perpendicular to the blade height direction;
- and
- a shaft-mounted part that extends from the platform toward the opposite side from the blade body, wherein
- a blade passage through which cooling air flows is formed inside the blade body, the platform, and the shaft-mounted part so as to extend through the blade body, the platform, and the shaft-mounted part in the blade height direction,
- the platform has a gas path surface that faces the blade height direction and comes in contact with the combustion gas, a shaft-side surface that is located back-to-back with the gas path surface, and a platform passage which is formed between the gas path surface and the shaft-side surface and through which cooling air flows,
- the blade has a communication passage that leads from at least one surface of the shaft-side surface of the platform and an outer surface of the shaft-mounted part through the platform passage to the blade passage,
- an opening of the communication passage in the at least one surface is blocked with a sealing member,
- the platform passage has an inflow passage portion that extends from a position near the blade passage in a direction having a component of a blade thickness direction based on that position,
- an inner surface defining the inflow passage portion includes a gas path-side inner surface that faces the shaft-side surface side, and a shaft-side inner surface that is the only surface of the inner surface facing the gas path-side inner surface and spreads in a direction having more of a component of the blade thickness direction than a component of the blade height direction, and
- an inner surface defining the communication passage intersects with and joins to the shaft-side inner surface of the inflow passage portion.
8 more elements
A blade manufacturing method comprising:
- an intermediate product forming step of forming an intermediate product of a blade having a blade body that forms an airfoil and is disposed inside a combustion gas flow passage through which combustion gas flows, a platform that spreads from an end in a blade height direction of the blade body in a direction having a component perpendicular to the blade height direction, and a shaft-mounted part that extends from the platform toward the opposite side from the blade body;
- a communication passage forming step of forming a communication passage that extends from an outer surface of the intermediate product to an inside of the intermediate product;
- and
- a sealing step of blocking an opening of the communication passage in the outer surface of the intermediate product, wherein
- in the intermediate product forming step,
- a blade passage through which cooling air flows is formed inside the blade body, the platform, and the shaft-mounted part so as to extend in the blade height direction;
- a gas path surface that faces the blade height direction and comes in contact with the combustion gas, a shaft-side surface that is located back-to-back with the gas path surface, and a platform passage which is formed between the gas path surface and the shaft-side surface and through which cooling air flows are formed in the platform;
- an inflow passage portion that extends from a position near the blade passage in a direction having a component of a blade thickness direction based on that position is formed as a portion of the platform passage;
- and
- as a part of an inner surface defining the inflow passage portion, a gas path-side inner surface that faces the shaft-side surface side, and a shaft-side inner surface that is the only surface of the inner surface facing the gas path-side inner surface and spreads in a direction having more of a component of the blade thickness direction than a component of the blade height direction, are formed when the inflow passage portion is formed, and
- in the communication passage forming step, a through-hole that extends from at least one surface of the shaft-side surface of the platform and an outer surface of the shaft-mounted part through the shaft-side inner surface of the inflow passage portion to the blade passage is formed as the communication passage.
8 more elements
Dependencies are inferred from the claim text.